Floats - language feature

Example from Java, AspectJ, Pizza, Deesel:

// ([0-9][0-9_]*\.([0-9][0-9_]*)?|\.[0-9][0-9_]*)([eE][+\-]?[0-9][0-9_]*)?[fFdD]?|[0-9][eE][+\-]?[0-9][0-9_]*[fFdD]?|[0-9]([eE][+\-]?[0-9][0-9_]*)?[fFdD]|0[xX]([0-9a-fA-F][0-9a-fA-F_]*\.?|([0-9a-fA-F][0-9a-fA-F_]*)?\.[0-9a-fA-F][0-9a-fA-F_]*)[pP][+\-]?[0-9][0-9_]*[fFdD]?

Example from JavaScript, TypeScript, Static Typescript:

// (\.[0-9]+|[0-9]+\.[0-9]*|[0-9]+)([eE][-+]?[0-9]+)?
80766866.0

Example from Python:

# (\d(?:_?\d)*\.(?:\d(?:_?\d)*)?|(?:\d(?:_?\d)*)?\.\d(?:_?\d)*)([eE][+-]?\d(?:_?\d)*)?

Example from Perl:

# (?i)(\d*(_\d*)*\.\d+(_\d*)*|\d+(_\d*)*\.\d+(_\d*)*)(e[+-]?\d+)?

Example from MySQL, Transact-SQL:

-- [0-9]+\.[0-9]*(e[+-]?[0-9]+)?

Example from JSON, JSON5, JSONiq, JSON with Comments, Superjson, Hocon, Jsonnet:

2.3

Example from Go:

// \d+(\.\d+[eE][+\-]?\d+|\.\d*|[eE][+\-]?\d+)

Example from Swift:

// [0-9][0-9_]*(\.[0-9_]+[eE][+\-]?[0-9_]+|\.[0-9_]*|[eE][+\-]?[0-9_]+)

Example from Ada:

-- [0-9_]+\.[0-9_]*

Example from Haskell:

-- 0[xX]_*[\da-fA-F](_*[\da-fA-F])*_*[pP][+-]?\d(_*\d)*

Example from Prolog, CLPR, GAEA, Progol:

% (\d+\.\d*|\d*\.\d+)([eE][+-]?[0-9]+)?

Example from Clojure, Hy, Fennel:

; -?\d+\.\d+

Example from Elixir:

# \d(_?\d)*\.\d(_?\d)*([eE][-+]?\d(_?\d)*)?

Example from Erlang:

% [+-]?\d+.\d+

Example from Julia:

# (\d+((_\d+)+)?\.(?!\.)(\d+((_\d+)+)?)?|\.\d+((_\d+)+)?)([eEf][+-]?[0-9]+)?

Example from Verilog, SystemVerilog:

// (\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[lL]?

Example from Reason:

// -?\d[\d_]*(.[\d_]*)?([eE][+\-]?\d[\d_]*)

Example from awk, CoffeeScript, bawk:

# [0-9][0-9]*\.[0-9]+([eE][0-9]+)?[fd]?

Example from F#:

// -?\d[\d_]*(.[\d_]*)?([eE][+\-]?\d[\d_]*)[fFmM]?

Example from Elm:

-- _?\d+\.(?=\d+)

Example from Eiffel:

-- ([0-9]+\.[0-9]*)|([0-9]*\.[0-9]+)

Example from D:

// 0[xX]([0-9a-fA-F_]*\.[0-9a-fA-F_]+|[0-9a-fA-F_]+)[pP][+\-]?[0-9_]+[fFL]?[i]?

Example from VHDL:

-- (\d+\.\d*|\.\d+|\d+)E[+-]?\d+

Example from PostScript:

% (\-|\+)?([0-9]+\.?|[0-9]*\.[0-9]+|[0-9]+\.[0-9]*)((e|E)[0-9]+)?(?=[()<>\[\]{}/%\s])

Example from Chapel:

// (\d*\.\d+)([eE][+-]?[0-9]+)?i?

Example from VBScript:

' [0-9]+\.[0-9]*(e[+-]?[0-9]+)?

Example from Applescript:

-- [-+]?(\d+\.\d*|\d*\.\d+)(E[-+][0-9]+)?

Example from Idris, Agda:

-- \d+[eE][+-]?\d+

Example from Protocol Buffers:

// (\d+\.\d*|\.\d+|\d+)[eE][+-]?\d+[LlUu]*

Example from AMPL:

# (\d+\.(?!\.)\d*|\.(?!.)\d+)([eE][+-]?\d+)?

Example from Monkey:

' [0-9]+\.[0-9]*(?!\.)

Example from AutoIt, AutoHotkey:

; (\d+\.\d*|\d*\.\d+)([eE][+-]?[0-9]+)?

Example from GNU Octave:

% (\d+\.\d*|\d*\.\d+)([eEf][+-]?[0-9]+)?

Example from TOML, GDScript:

# (\d+\.\d*|\d*\.\d+)([eE][+-]?[0-9]+)?j?

Example from Zephir, QML, SuperCollider:

// [0-9][0-9]*\.[0-9]+([eE][0-9]+)?[fd]?

Example from Icon, Unicon:

# [+-]?[0-9]*\.([0-9]*)([Ee][+-]?[0-9]*)?

Example from J:

NB. _?\d+\.(?=\d+)

Example from Scilab:

// (\d+\.\d*|\d*\.\d+)([eEf][+-]?[0-9]+)?

Example from Io:

// (\d+\.?\d*|\d*\.\d+)([eE][+-]?[0-9]+)?

Example from Boo:

# (\d+\.\d*|\d*\.\d+)([fF][+-]?[0-9]+)?

Example from Ceylon:

// \d{1,3}(_\d{3})+\.\d{1,3}(_\d{3})+[kMGTPmunpf]?

Example from SPARQL:

# [+\-]?(\d+\.\d*[eE][+-]?\d+|\.?\d+[eE][+-]?\d+)

Example from POV-Ray SDL:

// [0-9]*\.[0-9]+

Example from MiniD, Croc:

// ([0-9][0-9_]*)(?=[.eE])(\.[0-9][0-9_]*)?([eE][+\-]?[0-9_]+)?

Example from LiveScript:

# [0-9]+\.[0-9]+([eE][0-9]+)?[fd]?(?:[a-zA-Z_]+)?

Example from Modelica:

// \d+(\.?\d*[eE][-+]?\d+|\.\d*)

Example from Pig Latin:

-- [0-9]*\.[0-9]+(e[0-9]+)?[fd]?

Example from Golo:

# -?[\d_]*\.[\d_]*([eE][+-]?\d[\d_]*)?F?

Example from Ion:

// http://amzn.github.io/ion-docs/docs/spec.html
-0.12e4           // Type is float

Example from K:

/ ([0-9]*[.]?[0-9]+|[0-9]+[.]?[0-9]*)[eE][+-]?[0-9]+[ef]?

Example from Koka:

// [0-9]+\.[0-9]+([eE][\-+]?[0-9]+)?

Example from Felix:

// 0[xX]([0-9a-fA-F_]*\.[0-9a-fA-F_]+|[0-9a-fA-F_]+)[pP][+\-]?[0-9_]+[lLfFdD]?

Example from Linden Scripting Language:

// (\d+\.\d*|\.\d+|\d+)[eE][+-]?\d*

Example from Whiley:

// [0-9]+\.[0-9]+

Languages with Floats include Java, JavaScript, Python, Perl, MySQL, JSON, Go, Swift, Ada, Haskell, TypeScript, Prolog, Clojure, Mathematica, Elixir, Erlang, Julia, ActionScript, Verilog, Reason, awk, CoffeeScript, F#, Elm, OCaml, Eiffel, D, GraphQL, VHDL, XQuery, PostScript, Chapel, WebAssembly, VBScript, Applescript, Idris, Protocol Buffers, AMPL, Monkey, BlitzBasic, Agda, Coq, AutoIt, Zig, GNU Octave, TOML, Hy, Zephir, Icon, J, QML, Scilab, Io, IDL, Pony, Boo, EDN, QBasic, Ceylon, SPARQL, JSON5, Turtle, F*, SystemVerilog, Opa, SuperCollider, Cython, PL/pgSQL, POV-Ray SDL, MiniD, ClojureScript, Puppet, Ioke, LiveScript, Modelica, AutoHotkey, Pig Latin, Thrift, Maxima, Transact-SQL, AspectJ, Croc, Golo, Ion, Fennel, K, SourcePawn, Xtend, janet, Koka, HLSL, Unicon, Gosu, GLSL, LilyPond, progsbase, Felix, Futhark, Jule, Pizza, chaiscript, Cryptol, BlitzMax, Linden Scripting Language, ooc, GDScript, JSONiq, Nit, Whiley, Stan, Fancy, OpenEdge ABL, JSON with Comments, Shen, Superjson, Earl Grey, monte, Hocon, JSLT, Jsonnet, Pawn, JS++, parasail, Kal, BALGOL, Notation3, Easytrieve, FloScript, Urbiscript, CLPR, wah, nimrod, Flatline, AmbientTalk, CBOR data definition language, PromQL, SARL, Deesel, juttle, RAISE Specification Language, SquidConf, GAEA, bawk, Static Typescript, Progol

Read more about Floats on the web: 1. 2.

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